27. What does the slope of a position vs time graph represent? Time is X-axis and position is y-axis

Which explanation describes the forces involved for a person to walk down the sidewalk? a. the person's feet push backward on the sidewalk; the sidewalk pushes backward on the person. b. the person's feet push forward on the sidewalk; the sidewalk does not push on the person. c. the person's feet push backward on the sidewalk; the sidewalk pushes forward on the person. d. the person's feet push forward on the sidewalk; the sidewalk pushes forward on the person.

What is the force that opposes motion and works against the downward pull? a) friction b) gravity c) weight d) acceleration

Abar magnet cut in half will form a total ofpoles.a)fourb)eightc)two